Bugs 2822, 2551, 3163 fixes to XSLT

Bugs 2822, 2551, 3163 fixes to XSLT

Resent with additional comments.

Bug 2822 -- for leader6 types of i (nonmusical) or j (musical), the hitlist
uses an icon and label of Sound while the record display page uses
Music.  Modified record display to use Sound.

Bug 2551 -- for leader7 type of i says it's type Serial which is incorrect.
The bug report suggested Integrating Resource" but the latest install's
hitlist page uses Continuing Resource.  Changed the record display page
to also use Continuing Resource.

Bug 3163 -- if you have a 110 or 710 with a subfield a and a subfield b,
there's no space between them (on either hitlist or record display).
The two headings run together in the display.  Modified the utils file
to force a space.

The XSLT files referenced two icons which did not exist (globe.png and
drive_remote.png. Replaced those with icons from the same subject area
(world.png and drive_web.png).  Also, corrected spelling of icon name
from pencile.png to pencil.png.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>